152 CASEY 



must be closely allied to polongaia though probably a smaller species. 

 The statement of Kirby that the elevated spots are only evident near 

 the sides of the elytra, refers to the greater prominence observable, 

 as a rule, in the submarginal interval behind the middle; this is par- 

 ticularly pronounced in certain species of Buprestis, as well, and is a 

 general character, at least in this part of the family. Longipennis 

 bears much the same relationship to prolongata, that pertiimx does to 

 subcuprea, and in both cases the subspecific type comes from the same 

 locality as the species to which it is attached. In the latter case, the 

 long and parallel-winged type of the assumably subordinate form, is a 

 male, having besides some striking differences in the prosternal groove, 

 so that I have given it subspecific rank provisionally. In the case of 

 longipennis, however, the aberrant long-winged form is represented 

 by both male and female. It may be that we have here evidences of 

 true asexual dimorphism, but the material at hand is not sufficient 

 to decide this at present. The general appearance of the subspecies 

 in each case departs remarkably from that of the species, to a greater 

 degree in fact than the general differences in facies distinguishing a 

 number of allied though evidently distinct species. This is appar- 

 ently therefore one of those puzzles that occasionally arise in taxo- 

 nomic work, with incomplete material and in the absence of biologic 

 evidence. 



Group IV — Type horni Cr. 



This is a small and very local group, peculiar to the Southern Paci- 

 fic coast fauna. The only described species is the following: — 



Form moderately stout, elongate-oval, not very convex or shining, obscure 

 bronze above, with the margins of the pronotum and elytra and the 

 occiput behind the eyes generally brighter or greenish, the under surface 

 brighter cupreous; head coarsely punctato-rugose, strongly impressed 

 along the median line throughout, rather more hair)^ in the male though 

 sparsely, the eyes well developed and rather prominent; prothorax not 

 quite twice as wide as long, the sides parallel and straight to the middle, 

 there rounding and thence strongly converging to the apex, which is 

 feebly sinuate; surface moderately impressed and more punctured 

 along the median line, the impression with a feeble slender callus, 

 coarsely, deeply and densely punctate with intermingled irregular 

 callous spots from the broad and feebly tumescent ridges to each side 

 and very broadly, diffusely impressed obliquely behind the middle, 

 the basal pit deep, single; elytra barely at all intlated behind, twice as 

 long as wide and only slightly wider than the prothorax, the sides grad- 



